package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 新增菜品及其对应接口味信息
     *
     * @param dishDTO
     */
    @Override
    //涉及两张表，新增菜品还要求新增接口味信息，所以使用事务注解
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();

        //对象属性拷贝
        BeanUtils.copyProperties(dishDTO, dish);


        //向菜品表插入数据（1条）
        dishMapper.inert(dish);

        //获取insert语句自动生成的id值
        Long dishId = dish.getId();

        //向口味表插入数据（n条）
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //遍历口味列表，设置dishId属性
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 分页查询菜品及其对应接口味信息
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //开始分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品的批量删除
     * @param ids
     * @return
     */
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除-是否存在启售中的菜品？
        for (long id : ids){
            Dish dish = dishMapper.getById(id);
            //判断遍历到的菜品是否为启售状态 1-启用 0-停用
            if (dish.getStatus() == StatusConstant.ENABLE){
                //启售中的菜品不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能够删除-是否关联套餐？
        List<Long> setMealIds = setmealDishMapper.getSetMealIdsByDishId(ids);
        if (setMealIds != null && setMealIds.size() > 0){
            //存在关联套餐的菜品不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }*/


        //优化：根据菜品id集合批量删除菜品数据
        //sql:delete from dish where id in (?,?,?)
        dishMapper.deleteByIds(ids);

        //优化：根据菜品id集合批量删除关联的口味数据
        //sql:delete from dish_flavor where dish_id in (?,?,?)
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品及其对应接口味信息
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavors(Long id) {
        //根据id查询菜品信息
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //将查询到的数据封装到DishVO对象中
        DishVO dishVO = new DishVO();
        //对象属性拷贝
        BeanUtils.copyProperties(dish, dishVO);
        //设置口味数据
        dishVO.setFlavors(dishFlavors);

        //返回DishVO对象
        return dishVO;
    }

    /**
     * 根据id修改菜品及其对应接口味信息
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表的基本数据
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //遍历口味列表，设置dishId属性
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 启售/停售菜品
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        //创建Dish对象，设置id和status属性
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE){
            //如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            //select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setMealIds = setmealDishMapper.getSetMealIdsByDishId(dishIds);
            if (setMealIds != null && setMealIds.size() > 0){
                for (Long setMealId : setMealIds){
                    Setmeal setmeal = Setmeal.builder()
                            .id(setMealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品及其对应接口味信息
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList){
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);

            //根据菜品id查询对应的口味数据
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


}
